Fertility of dairy cows milked once daily or twice daily in New Zealand.

Simple item page
dc.citation.issue11
dc.citation.volume105
dc.contributor.authorJayawardana JMDR
dc.contributor.authorLopez-Villalobos N
dc.contributor.authorMcNaughton LR
dc.contributor.authorHickson RE
dc.coverage.spatialUnited States
dc.date.accessioned2024-01-17T20:52:36Z
dc.date.accessioned2024-07-25T06:34:56Z
dc.date.available2022-09-22
dc.date.available2024-01-17T20:52:36Z
dc.date.available2024-07-25T06:34:56Z
dc.date.issued2022-11
dc.description.abstractThe objective of this study was to evaluate the reproductive performance of New Zealand dairy cows with different milking regimens. A total of 2,562 herds calving in 2017 met the criteria for inclusion in this study. The herds were classified into 5 different milking regimens: 260 herds with cows milked once daily (OAD) during the entire lactation, 1,206 herds with cows milked twice daily (TAD) during the entire lactation, 94 herds that were switched to OAD milking from TAD milking during the mating period (OAD-M), 700 herds that were switched to OAD milking from TAD milking after peak lactation (OAD-P), and 302 herds that switched to OAD milking from TAD milking at end of the lactation (OAD-E). Time from the start of mating to first service (SMFS), start of mating to conception (SMCO) and first service to conception (FSCO) were analyzed using survival analysis. Time from SMFS, SMCO and FSCO was significantly shorter in cows milked OAD compared with cows milked TAD. Also, cows milked OAD had fewer services per conception and higher mean 3-wk submission (SR21), in calf by 3 wk (PR21), in calf by 6 wk (PR42), conception to the first service (PRFS), 3-wk calving (CR21) and 6-wk calving (CR42), and lower not in calf (NIC) than herds with TAD, OAD-M, OAD-P, OAD-E milking cows. Fertility performance differed with parity; first-parity cows had lower SR21, 6-wk submission (SR42), PR21, PR42, PRFS, CR21, and CR42 values, and higher NIC values than second-parity cows. Third parity cows had the highest values for SR42, PR21, PR42, PRFS, CR21, and CR42, and lowest value for NIC compared with cows of other parities. Significant but minor interactions between milking regimen and parity existed for SMFS, SMCO, FSCO, SR21, SR42, PR21, PR42, PRFS, NIC, and CR21.
dc.format.pagination8911-8923
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/36153161
dc.identifier.citationJayawardana JMDR, Lopez-Villalobos N, McNaughton LR, Hickson RE. (2022). Fertility of dairy cows milked once daily or twice daily in New Zealand.. J Dairy Sci. 105. 11. (pp. 8911-8923).
dc.identifier.doi10.3168/jds.2021-20946
dc.identifier.eissn1525-3198
dc.identifier.elements-typejournal-article
dc.identifier.issn0022-0302
dc.identifier.piiS0022-0302(22)00531-8
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70469
dc.languageeng
dc.publisherElsevier
dc.relation.isPartOfJ Dairy Sci
dc.rights(c) 2022 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectcrossbreeding
dc.subjectfertility
dc.subjectgrazing
dc.subjectmilking frequency
dc.subjectPregnancy
dc.subjectFemale
dc.subjectCattle
dc.subjectAnimals
dc.subjectDairying
dc.subjectNew Zealand
dc.subjectMilk
dc.subjectLactation
dc.subjectFertility
dc.titleFertility of dairy cows milked once daily or twice daily in New Zealand.
dc.typeJournal article
pubs.elements-id457173
pubs.organisational-groupOther
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